Prologo Nago R4 Pas Saddle With Nack Rail

LIGHTWEIGHT, RACE-READY PERFORMANCE WITH ANATOMICALLY DESIGNED SUPPORT AND PRESSURE RELIEF FOR LONG-DISTANCE COMFORT.

The Prologo Nago R4 PAS is a high-performance road cycling saddle developed to deliver exceptional support, freedom of movement and comfort. Refined through Prologo's Pressure Map MyOwn testing, it combines a semi-round ergonomic profile, advanced variable-density padding and a central PAS pressure-relief channel to support efficient pedalling over long distances.

An evolution of the iconic Nago saddle first introduced in 2008, the Nago R4 PAS builds on a race-winning heritage that includes success at the Giro d'Italia and numerous Spring Classics.

Featuring a long-fibre carbon base and lightweight Nack carbon-composite rails, this premium saddle delivers the stiffness, low weight and performance demanded by competitive cyclists.


KEY FEATURES

PAS Pressure Relief Technology
Prologo's Perineal Area System (PAS) features an open central channel designed to reduce pressure on sensitive areas, minimise numbness and promote improved blood flow. The design provides targeted pressure relief without compromising pedalling support.

T-Shaped Anatomical Profile
The T-shaped design provides greater freedom of movement, allowing riders to adjust their position along the saddle. Its wider rear seating area and anatomical centre support comfortable positioning during different phases of a ride.

Semi-Round Ergonomic Shape
The semi-round profile is designed for cyclists with average pelvic rotation flexibility, providing a balance of support and freedom of movement. The 137 mm width is particularly suited to riders with a narrower sit-bone distance.

Variable-Density Foam Padding
Two independent sections of next-generation, variable-density foam provide targeted support and cushioning. This construction helps distribute pressure while maintaining comfort and stability throughout the pedal stroke.

Long-Fibre Carbon Base
The lightweight carbon-fibre base provides a stiff, responsive platform designed to maximise pedalling efficiency while keeping overall saddle weight to a minimum.

Nack Carbon-Composite Rails
Prologo's premium Nack rails combine carbon fibre, Kevlar and aluminium filaments to deliver an exceptionally lightweight and stiff construction. Designed for high-performance cycling, they help reduce weight without compromising structural strength.


WHY TO CHOOSE

The Prologo Nago R4 PAS combines race-focused construction with an ergonomic design developed for sustained riding comfort.
Its semi-round profile and T-shaped design allow riders to move naturally between riding positions, while the PAS channel reduces pressure on sensitive areas during extended periods in the saddle.
The combination of a carbon-fibre base, Nack rails and variable-density padding creates a lightweight, supportive platform that balances comfort with efficient power transfer.
With a manufacturer claimed weight of just 126 g, the Nago R4 PAS is an excellent choice for performance-focused cyclists seeking a premium saddle without unnecessary weight.


PERFECT FOR

Competitive road cyclists seeking a lightweight, race-ready saddle.
Endurance riders wanting targeted pressure relief and support during longer rides.
Cyclists with average pelvic flexibility who prefer a semi-round saddle profile.
Riders with narrower sit-bone spacing looking for a 137 mm saddle.
Performance-focused cyclists upgrading to a premium carbon-composite rail saddle.


FULL SPECIFICATIONS

Brand: Prologo
Model: Nago R4 PAS
Saddle Dimensions: 245 x 137 mm
Saddle Shape: T-Shaped, Semi-Round
Pressure Relief: PAS (Perineal Area System) Open Central Channel
Padding: Variable-Density Foam
Base: Long-Fibre Carbon
Rails: Nack - Carbon Fibre, Kevlar and Aluminium Filaments
Manufacturer Claimed Weight: 126 g
Discipline: Road Cycling